Even if others have run Hardrock more times, it’d be fair to call Karl Meltzer (Redbull/Hoka One One) Mr. Hardrock. He’s won the race five times, finished second to Scott Jurek once, and, on Friday, will be toeing the line in Silverton for his tenth time. Watch the following interview to find out how Karl’s approach to acclimatization and trekking poles have changed, how his running has gone this spring, and the value of running one’s own race among many other things. Check it out.